Could be a # of things. First is the battery up to doing the job? If you
have a voltage meter test to make sure you have close to 12V across the
battery then turn on headlights voltage should not drop more than about
1 volt. If so battery most likely is OK. Dirty battery cables will be
the next thing to look for. Are the terminals clean & corrosion free
at the battery? If you have found no problem so far your starter may
need to be replaced. Do you have the ability to use jumper cables &
jumper it from another battery?If you can
jump start it or put a battery charger on it & git it started again
you can test voltage across the battery. with car running you should
have about 14V if 12.5V or less you need a new alternator.

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A battery's voltage is properly tested under load. This sounds like your battery is low on fluid or has not been charging properly. Not charging properly could be from low battery fluid, poor cable connections or a failing alternator. You did not state whether you tested this voltage issue with the vehicle running or not. If the vehicle was running when you observed this change in voltage upon turning on the headlights, then a bad alternator is most certainly suspect.

will your car start if you put ignition key in run postion and then put remote power to the starter to crank engine? If it will you probably have an issue with the electrical portion of your ignition switch. Check to see if you have power to the high voltage side of your starter relays. If not check for a bad fuse. If so check to see if low side powers up when key is turned. If so it means you are gettintg current from the switch. So keep checking for power all the way to the starter. If not check and replace the ignition switch.